I was diagnosed with strep throat 3 days ago and am taking 875 mg of amoxicillin 2x daily as prescribed by doc. I don’t feel it helping at all. I’ve developed a bad cough now, not a dry one, but a gurgle-ish one, body aches. I’m 69, take no other meds, in pretty good shape but concerned that the medication is not making me feel better like it has in past. Your thoughts?